My personal preference is for the top-left logo to always bring a user back to the domain's top-level ignoring any sub-domains, though I'm not sure that could be considered best-practice.
This approach works for me though, because I find most company-blogs to have a much lower volume of published content than a website whose primary function is that of a blog. In most cases, I've wound up on the site from a direct-link to whatever blog post I'm reading. If what I've read in that post is interesting, I'm probably going to want to check out the product or service they're selling before reading any more of their company blog.
This approach works for me though, because I find most company-blogs to have a much lower volume of published content than a website whose primary function is that of a blog. In most cases, I've wound up on the site from a direct-link to whatever blog post I'm reading. If what I've read in that post is interesting, I'm probably going to want to check out the product or service they're selling before reading any more of their company blog.